Grinding-mill.



A. J. SAGKETT.

GRINDING MILL.

APPLICATION FILED JUNEIS, 1913.

1 ,098, l 74. Patented May 26, 1914.

3 SHEETS-SHEET 1.

llmh A. J. SAGKETT.

GRINDING MILL.

APPLICATION FILED JUNE-.16, 1913.

3 SHEETS-SHEET 2.

Patented May 26, 1914.

W777esses A. J. SAGKETT.

GRINDING MILL.

APPLICATION FILED JUNE 16, 1913.

1 ,098, 1 74, Patented May 26, 1914.

3 SEEETSSHEET 3.

,mmm //////7/// ENTTEE) STATES PATENT @FFTQE.

AUGUST J. SACKETT, OF BALTIMORE, MARYLAND.

GRINDING MILL.

, To all whom it may concern Be it known that 1, AUGUST J. SACKETT, a citizen of the United States of America, residing at Baltimore, Maryland, have invented certain Improvements in Grinding- Mills, of which the following is a specification.

This invention relates to certain improvements in a mill especially adapted to grind raw bone, as will hereinafter fully appear.

In the description of the said invention which follows, reference is made to the accompanying drawings, forming a part hereof, and in which Figure 1 is a plan view of the improved mill; and Fig. 2 a side view of the same looking in the direction indicated by the ar row in Fig. 1. Fig. 3 is a section taken on the broken line m0c in Fig. 1. Fig. 4 is a back view of a grinding plate forming a part of the mill. Fig. 5 is an enlarged section of the grinding plate taken on the broken line fl/ 1/ in Fig. 3; and Figs. 6 and 7 are sectional views of parts of the plate illustrating the character of its grinding surface. Fig. 8 is a sectional view of a hub formed of two disks secured to the driving shaft of the mill, carrying certain heaters which form elements of the grinding apparatus, together with parts of two grinding plates; and Fig. 9 is a section of Fig. 8 taken on the broken line ov. Figs. 10 and 11 are respectively, an exterior, and a sectional view, both on an enlarged scale, of one of a system of bars and their attachments, which serve to place a strain on the grinding plates to yieldingly hold their grinding surfaces nearly contact with the rotary heaters. Fig. 12 is a section taken on the line az in Fig. 11; and Fig. 13 is a section of Fig. 4 taken on the broken line w w.

Referring now to the drawings, 1 is the shell or casing of the mill having the hopper 2 into which the materials to be ground are introduced. The shell is open at the bot-tom, and is therefore adapted to rest on sills notshown, between which the ground material falls.

3 is the main shaft of the mill to which rotary grinding appliances hereinafter described, are secured; and it is suitably supported in bearings A.

5, 5 are fly or balance wheels on the shaft 3.

7, 7 are grinding plates two of which are employed in the mill. They are placed face to face, that is to say, with their grinding Specification of Letters Patent.

Application filed June 16, 1913.

Patented May 26, 1914.

Serial No. 774,071.

surfaces opposite to each other; and 9 is a sub-hopper formed by channeling the inner surface of the plates 7, adapted to conduct the material to be ground from the main hopper 2 to a point on a horizontal line extending through the center of the driving shaft- 3, as shown in Fig. 13. The grinding plates 7 are provided with trunnions 10 carrying loose grooved wheels 12 which rest on fixed square track rails 13 held in place by lugs 14 on the front and rear plates of the casing. lifting of the wheels 12 and the grinding plates. In order that there may be a certain freedom of motion of the grinding plates 7 in a manner and for a purpose hereinafter described, the angle of the V shaped grooves in the wheels 12 are made greater than that of the track rails 13, as shown in. Fig. 3. Fastened to the shaft 3 are disks 17, see particularly Figs. 8 and 9, between which are secured by means of bolts, the knives or heaters 19; and the grinding plates are yieldingly held by means hereinafter described, practically in contact with the rotary heaters.

Referring now to Figs. 5, 8 and 9 it will be seen that the grinding plates 7 are each formed of an annular plate a flanged at its circumference except where the same is in terrupted by the sub-hopper 9, and an annular plate 6 which is bolted to the plate as, having the overhanging portion 0 which comes nearly in contact with the ends of the heater as shown in Fig. .8. The portion of the inner plate I) which is within the overhanging part c, is provided with radial sawtooth shaped ribs (5 best shown in Fig. 7; and the overhanging part 0 is radially slotted as shown in Fig. 8, to permit of the escape of such portions of the material as have been ground to a proper degree of fineness. The devices hereinbefore briefly alluded to as adapted to yieldingly hold the grinding plates 7 nearly in contact with the heaters 19, consist of bars 20 which at their outer ends extend through the casing, and are held by locking nuts f to the holders 21 on the outside of the front and rear plates of the casing as shown in Figs. 1, 2, 10 and 11. At their inner ends, the bars 20 are branched and pivoted to lugs g on the outer surfaces of the grinding plates 7, as shown in Figs. 10 and 11. Adjacent to collars 71., the bars 20 are threaded and provided with nuts 23; and over the said nuts are placed sleeves 24: whereby the nuts can he turned.

Similar rails 15 serve to prevent.

Within the sleeves 2st and extending from the annular projections therein to the inner surface of the holders 21, are compressed springs 25, which serve to yieldingly retain the grinding plates practically in contact with the heaters 19, as before stated. To increase the compression of the springs, the sleeves 24 are turned in such direction as to unscrew the nuts 23, as will be readily understood.

From the foregoing description it will be seen that the trunnioned grinding plates are free to oscillate vertically independently of the whee s that support them, and are also adapted for a limited horizontal oscillation due to the grooves in the supporting wheels not closely fitting the track rails which support them; and that they can move bodily toward or from the heaters while oscillating in one or both, or any intermediate or compromised direction. This peculiar feature in the mill particularly adapts it for cruslr ing tenacious materials, such as raw bone, and others which have little uniformity in size, as the distention of the grinding plates at one point of their circumference, causes the closing of the same at a point diametrically opposite; and that in the grinding operation the plates are constantly subjected to a complex or universal tilting motion without rotation.

When the mill is in operation the materials introduced thereto are caught between the rotating heaters and the corrugated grinding surfaces of the plates 7, and as they are reduced in size, and thrown oif by centrifugal force, the product which is sulfioiently ground, escapes through the slots in the overhanging portions 0 of the inner plates Z) into the casing, and falls through its open bottom.

I claim as my invention 1. In a grinding mill, a casing, a rotary shaft within the casing, and heaters carried by the shaft, combined with non-rotative grinding plates having diametrically-placed supporting trunnions, whereby they are susceptible of a swinging or vibratory movement with respect to the heaters.

2. In a grinding mill, a casing, a driving shaft which extends through the casing, heaters carried by the shaft, a grinding plate at either side of the heaters having trunnions, wheels on the trunnions, and track rails upon which the wheels are adapted to run, combined with spring-controlled extensihle and contractible bars whereby the grinding plates are yieldingly held in practical contact with the heaters.

3. In a grinding mill, a casing, a driving shaft which extends through the casing, heaters carried by the shaft, a grinding plate at either side of the heaters having trunnions, wheels on the trunnions, and track rails upon which the wheels are adapted to run, combined with extensible and contractihle bars whereby the grinding plates can be adjusted with reference to the heaters, and springs on the bars to yieldingly hold the said plates in practical contact with the heaters.

at. In a grinding mill, a casing, a driving shaft which extends through the casing, heaters carried by the shaft, a grinding plate at either side of the heaters having trunnions, wheels on the trunnions, and track rails upon which the wheels are adapted to run, combined with bars which unite the grinding plates with the sides of the casing, compressed springs upon the said bars, and means whereby the resistance of the grinding plates to separation from the heaters can be increased or diminished.

In a grinding mill, a casing, a driving shaft which extends through the casing, heaters carried by th shaft, a grinding plate at either side of the heaters having trunnions, wheels on the trunnions, and track rails upon which th wheels are adapted to run, combined with bars which unite the grinding plates with the sides of the casing, compressed. springs upon the said bars, and means whereby the resistance of each of the grinding plates to separation from the heaters can be independently increased or diminished.

6. In a grinding mill, a casing, a driving shaft which extends through, the casing. heaters carried by the shaft, a grinding plate at either side of the heaters having trunnions, wheels on the trunnions, and track rails between which the wheels are adapted to run, combined with bars which unite the grinding plates with the sides of the casing, compressed springs upon the said bars, and means whereby the resistance of each of the grinding plates to separation from the heaters can be independently increased or diminished.

AUGUST J. SAGKETT.

Witnesses:

WM. T. HOWARD, SARAH Sorro'rm.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I C." 

